A good first effort. It's got some nice texture and detail to it and some post processing tricks could have bumped this up into the 5's. Didn't come up for me in voting, but I think I would have likely given it a 5.
nice PoV, next time just increase your f/stop to at least a f/20. (forgive my being opiniated, i love this pic and i think it could have been a high scorer)